Monsanto Co's unapproved, experimental genetically engineered wheat, which is feared to have potentially contaminated U.S. wheat supplies after it was found growing in an Oregon field this spring, was kept in a U.S. government storage facility until at least late 2011, according to documents obtained by Reuters. The revelation that the seed for the controversial genetically engineered wheat was kept viable in a Colorado storage facility as recently as a year and a half ago comes as the U.S. government is investigating how the strain of experimental wheat wound up growing in an Oregon field this spring. The probe by...